An oxidation step for sulfide and transition ores prior to CN leaching to recover 60 to 90 percent of metals from those ores. Use of tona, soda ash or carbonate source in treating sulfide and transition ores for CN leaching recovery of metals, including gold and silver. The oxidation of sulfide and transition ores in the presence of carbonate. Low moisture content in the heap, to enhance available oxygen, during the oxidation of sulfide and transition ores in the presence of carbonate.

A process for recovery of metal comprising copper and/or a precious metal from a metal containing material, including the steps of: leaching the metal containing material with an alkaline lixiviant and an amino acid or derivative thereof in order to produce a metal containing leachate; and extracting the metal from the leachate.

An oxidation step for sulfide and transition ores prior to CN leaching to recover 60 to 90 percent of metals from those ores. Use of tona, soda ash or carbonate source in treating sulfide and transition ores for CN leaching recovery of metals, including gold and silver. The oxidation of sulfide and transition ores in the presence of carbonate. Low moisture content in the heap, to enhance available oxygen, during the oxidation of sulfide and transition ores in the presence of carbonate.

A sequential treatment process for primary and secondary copper sulphide heap leaching such as Chalcopyrite, Bornite, Chalcosine, Coveline or other sulfide and mixed copper ores is provided. Specifically, the treatment process consists of a sequential treatment of crushed ore with size p80 less than 38 mm, preferably under 19 mm, which is arranged in a dynamic heap or primary leaching heap, in which once leached in the dynamic heap, the ore is removed from the heap and transferred to a new heap to be subjected to a secondary leaching process in a permanent heap, where the leaching process in all its stages is carried out under increased concentrations of chlorine ion, [Cl.sup.?]>40 g/L, which improves the thermodynamics and physic-chemical balances that the solutions of the process are established, which generates important benefits on the metallurgical performance of this sequential treatment.

A method for separating zirconium oxide/hafnium oxide by pyrometallurgy. The mixture of zirconium oxide/hafnium oxide, carbon and pure bromine react one hour at 650? C., then added to molten salt mixture for rectifying separation, and then maintained two hours at rectifying tower bottom below 357? C., to get the non-target substance; and then maintained five hours at 357? C. to collect the target substance zirconium tetrabromide; the residue in the reactor is retained, then rectification separation is performed in the same device, heated to 400? C. to retain more than five hours, to get hafnium tetrabromide, then the zirconium tetrabromide and hafnium tetrabromide are substituted by magnesium to get the pure zirconium and pure hafnium.

Process for the removal of arsenic from materials with a high arsenic content or materials with a high content in arsenic and selenium that comprises: Adding the material to a pressurized reactor; Adding an alkaline lixiviating solution of a strong base dissolved in water to the reactor; Adding an oxidizing gas to the reactor; Mixing the above components in the reactor to obtain a homogenous pulp and subjecting it to a lixiviation under pressure that is selective for arsenic with respect to the other elements of interest present in the treated material; Subjecting the pulp obtained from the lixiviation step to a first solid-liquid separation step, thereby obtaining a liquor with dissolved arsenic and a solid with low arsenic content; Subjecting the liquor with dissolved arsenic to a precipitation of the arsenic with a precipitating agent, selecting compounds that supply the following cations: Ce.sup.3+, Fe.sup.3+, Mg.sup.2+, and a combination of Fe.sup.3+ and Ca.sup.2+; And, subjecting the product of the arsenic precipitation step to a second solid-liquid separation step, thereby obtaining a solid arsenic-containing product and an alkaline liquor free of arsenic.

Optionally the process also comprises: Subjecting the alkaline liquor free of arsenic to a sodium sulfate (Na.sub.2SO.sub.4) crystallization step, thereby obtaining a pulp composed of Na.sub.2SO.sub.4 crystals and an alkaline liquor free of Na.sub.2SO.sub.4; Subjecting the product of the Na.sub.2SO.sub.4 precipitation step to a third solid-liquid separation step, thereby obtaining a solid comprising Na.sub.2SO.sub.4 crystals and an alkaline liquor.

An oxidation step for sulfide and transition ores prior to CN leaching to recover 60 to 90 percent of metals from those ores. Use of tona, soda ash or carbonate source in treating sulfide and transition ores for CN leaching recovery of metals, including gold and silver. The oxidation of sulfide and transition ores in the presence of carbonate. Low moisture content in the heap, to enhance available oxygen, during the oxidation of sulfide and transition ores in the presence of carbonate.

Provided is a method for removing arsenic from copper smelting soot and comprehensive recovery of valuable metals. According to the method, a metal leaching synergist is prepared through thiol-ene click chemical reaction, which is capable of reacting more effectively with arsenic and metal impurities in the copper smelting soot due to its special chemical structure, thereby improving leaching efficiency; and the cage-like structure of the polysilsesquioxane provides excellent chemical stability, the removal rate of harmful substances in the copper smelting soot can be increased by using the synergist, environmental pollution is reduced, meanwhile, the recovery rate of metal resources is increased, and the requirements of green chemistry and sustainable development are met. The present disclosure realizes the centralized management of As and also realizes the step-by-step recovery of valuable metals such as Cu, Zn, Pb, Bi, and In.

A method of recovering a metal from a low-grade ore which is subjected to cyanide leaching to produce a PLS which contains a metal cyanide which is removed from the PLS by ultrafiltration and nano-filtration, and then acidified and sulphidised to produce a metal sulphide from which the metal is extracted, and hydrogen cyanide which is recycled to the cyanide leaching step.

A method of processing size-reduced battery materials comprising aluminum, copper and black mass, may include: subjecting the size-reduced battery materials to a caustic leaching process to yield a pregnant leach solution; physically separating the pregnant leach solution into oversized solids and a screened leach stream, the oversized solids being rich in copper; and filtering the screened leach stream to yield a filter cake that is rich in black mass, and a filtered leach stream that is rich in aluminum.